I have just finished processing, following Moonmoth's instructions, which did so well for me before, seven imperial
Rome mint aes.
The newest of them (in my possession) is the Iuventas
sestertius, which is emerging much improved (see recent
IVVENTAS thread; new photo tomorrow). The others, including a
PAX I used for a Xmas card last year, looked
fine when I got them and for some time thereafter. All of them, I think,
had been hastily treated for BD, by middlemen if not the seller, to make them saleable. I recommend checking your whole
collection of brass, bronze, and copper once a year. It is noteworthy, I think, that none of these came from any dealer like
Forvm, or those that publish hardcopy catalogues. But if you live in any kind of odd climate, check them all, anyway.
Pat L.